added cyclus_root option to install.py
added cyclus_root option to install.py

sskutnik/TutorialStorage,gidden/cycstub,cyclus/cycstub,mbmcgarry/TutorialStorage,gonuke/TutorialStorage,gidden/cycstub,mbmcgarry/TutorialStorage,harrisgreenberg/tutorial,sskutnik/TutorialStorage,cyclus/cycstub,jdangerx/TutorialStorage,jdangerx/TutorialStorage,harrisgreenberg/tutorial,gonuke/TutorialStorage